单项选择题
（）（滚装船）have doors at the bow or stern.
A. Tramps
B. Container ships
C. Ro/Ro ships
D. bulk carriers
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（）(送出) two head lines ,one from each side.
A. Heave away
B. Give out
C. Take in
D. Take away -
单项选择题
We must（）(后移)one metre.
A. shift aft
B. shift astern
C. move aft
D. move back -
单项选择题
We have to（）(前移)one metre.
A. shift ahead
B .shift head
C. move forward
D. shift forward
